Process of making securing means



Max-ch 1953 H. E. DICKERMAN Y PROCESS OF MAKING SECURING MEANS Filed Dec. 24, 1949 IN VEN TOR.

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Patented Mar. 3, 1953 UNITED STATES PATENT OFFICE PROCESS MAKING SECURING MEANS Hubert E. Dickernfan, sprin s-ea, Mass, as-

signor 'to Savage Arms Corporation, Chicopee Falls, Mass., a corporation Application December 24, 1949, Serial No. 134,993

-1 Claim.

My invention relates to improvements in 'securing means and the method of producing the same.

The principal objects of my invention aredire'cted to the provision of means forsecuring objects together and the method of producing the same.

The novel features of the invention are adapted for many and various uses 'Where it is desired to the end that, whenw'all sections are secured together thereby they'pr'ovide "a strong rigid structure which is durable "and "not likely to become loosened.

According tothe prior art, riveting tabshave been provided on sections which are inserted in elongated openings of other sections and "then riveted. Since the'tabs-cannot when riveted protrude beyond the plane of the latter section, the

tabs are necessarily relatively short and =f ai1 to,

secure the parts together-satisfactorily. This is for the reason the opposite outer corners of the tabs are rounded so as to not properly fill up the slots when riveted. The rounded corners result from the inability of obtaining the sharp corners in the tab forming die parts and the wear thereof in formingthe tabs.

According to special features of the invention, the tabs are formed by first providing a hole in sheet metal and subsequently forming a section from the sheet which has a tab projecting into the hole. The tab has a transverse width somewhat less than the diameter of the hole so that the tab is provided with opposite sharp corners or points. The tab, then, with the sharp pointed corners, as distinguished from rounded corners, is more securely riveted to another part having apertures in which the tabs are riveted.

With the foregoing and various other novel features and advantages and other objects of my invention as will become more apparent as the description proceeds, the invention consists in certain novel features of construction and in the combination and arrangement of parts as will be hereinafter more particularly pointed out in the claim hereunto annexed and more fully described and referred to in connection with the accompanying drawings wherein: M

*Fig. 1 is a plan view ofa portion of a strip of metal --t o explain the invention;

Fig. 2 is a plan view of a wall section punched OliStfl-Inpfid from the strip of metal;

M Fig. 3 is an edge view of the sectionshown in F g- 2;

Fig. 4 is a perspective view of a jointure formed bythe novel features of the invention; and

Fig. 5 is a partial plan View of a wall section. -Referring now-to thedrawings more in detail, theinvention will be fully described. V

l A strip of relatively thin metalis shown at 2-in I Fig. 1 from which a wall section is to be formed according to the invention.

'As a-first step in punching or blankingoperations by means of a punch press or the like, the strip 2 is provided with a row of transversely spaced holes 4, as shown.

Successive rows of holes, spaced a desired predetermined distance apart, are provided by advancing the strip 2 to the punching mechanism, so as to provide a continuous method.

Subsequently the strip is positioned relative-to blanking dies to locate a row of holes in alpredetermined manner relative to a wall section 'to be formed "and indicated by the dot-dash lines 6, the section so "formed being shown at 8 in Figs. 2 and 3. p

The arrangement of the mechanism and its operation will be such as to produce successive sections 8 having a plurality of riveting tabs II] on opposite longitudinal edges thereof.

Obviously the section 8 may be of any dimension and may be provided with as many tabs such as I0 as may be desired on either one or both of its edges. The form of the section 8 shown is for illustrative purposes only, and the section 8 may be a part integral with other parts.

According to the invention, the opposite edges of the tabs are straight and are clean cut. Their outer ends are concaved as shown so as to provide sharp points l2 which is highly desirable for riveting. Preferably the width of the tabs ID will be somewhat less than the diameter of the holes 4 to provide the sharp oints l2.

Were a section having tabs formed by a single operation, it would be difiicult if not impossible to provide the sharp points desired. Instead the points would be rounded to some extent and thus make a satisfactory riveting operation practically impossible.

By first providing the holes such as 4 and then forming the sections as described, the points of the tabs are substantially needle-point-sharp, as is desired.

The diameter of the holes 4 may be of such relation to the transverse width of the riveting tabs as may be desired, the object being to provide tabs having clean opposite edges and sharp points.

Sections formed after the manner described are assembled with and secured to other sections which are provided with slots adapted to receive the riveting tabs.

Such a section is shown at 14 in Fig. 5 in which a plurality of tab receiving slots I6 are provided.

The tabs I0 of section 8 are inserted in the slots 16 of the section [4 and are riveted by any suitable mechanism, as indicated in Fig. 4.

The slots [6 will be proportioned with reference to the tabs so that there will be no appreciable play therebetween.

The tabs will be of such length that the sharp points thereof will protrude slightly beyond the slotted member l4 sufficiently for a strong and rigid riveted connection.

The points being sharp rather than slightly rounded as is ordinarily the case, the riveting operation causes the ends of the tabs to rigidly engage the ends of the slots while, of course, the other parts of the tabs engage adjacent parts of the slots, thus securing the members 8 and 14 together.

By first providing the holes and by subsequently forming the riveting tabs, the sharp points are assured and thereby the riveted together members are more securely and rigidly associated than has been heretofore possible with similar securing means.

While not shown, it may in some cases be desirable to provide the tabs with relatively converging edges or sides and the same may be accomplished according to the invention and at the same time provide the desired and necessary sharp points for more secure riveting.

While for illustrative purposes the holes are formed prior to the tabs it will in some cases be desired to first form the tabs and then form the holes to provide tabs having sharp points.

The invention may be embodied in other specific forms without departing from the essential characteristics thereof. Hence, the present embodiments are therefore to be considered in all respects merely as being illustrative and not as being restrictive, the scope of the invention being indicated by the appended claim rather than by the foregoing description, and all modifications and variations as fall within the meaning and purview and range of equivalency of the appended claim are therefore intended to be embraced therein.

What it is desired to claim and secure by Letters Patent of the United States is:

The method of forming from sheet metal wall members having spaced tabs extending outwardly from opposite sides and provided with concaved ends terminating in sharp riveting corners at outer opposite sides thereof, piercing sheet metal with horizontally spaced vertical rows of relatively spaced round holes to provide concave outer end portions for riveting tabs to be formed at opposite sides of a wall member, punching said sheet metal between adjacent vertical rows of holes to form an elongated wall member of relatively less transverse width than the distance between adjacent sides of the holes of said rows and having tabs extending from opposite longitudinal sides into said holes, said tabs having substantially parallel upper and lower edges and being no greater in transverse width than the diameter of said holes whereby said edges intersect said concave outer end portions and provide sharp riveting point at upper and lower outer corners of the tabs.

HUBERT E. DICKERMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 886,515 Jude May 5, 1908 935,970 Guett Oct. 5, 1909 1,656,794 Messenger Jan. 17, 1928 1,901,584 Daley Mar. 14, 1933 2,006,417 Topping July 2, 1935 2,264,897 Becker et al Dec. 2, 1941 2,453,504 Fleischer Nov. 9, 1948 2,482,391 Webster Sept. 20, 1949 FOREIGN PATENTS Number Country Date 10,198 Great Britain Apr. 26, 1910 166,728 Great Britain July 26, 1921 

